The MHD Documentation Database (MDDB)

An overview of the MDDB project is given in a CWGM7 presentation, available here.

Background

Aim: provide a reference documentation database of MHD
modes observed in all major stellarators.

Useful for: finding parameterisation of modes (e.g. Alfvén
scaling) across many shots, also for cross-machine comparisons

How: The MHD documentation database (MDDB) will be
generated using automated techniques scanning 10,000s of
shots.

Data: choose Mirnov channels -- arrays on all devices, an
"always-on" diagnostics, likely to have consistent
configuration (sampling, gain, etc) across many shots.

Since 2007, data mining results have been obtained from H-
1, Heliotron J, TJ-II, W7AS and LHD. (also JT-60).
In this time our methods have improved, however this means
that results from each device are somewhat ad hoc.
Different code versions, different pre-processing filters,
different clustering algorithms.
Code had limitations: both in how easily it could be
extended, and code complexity became barrier to new
users
In order to make pyfusion code usable for collaborators, and
to allow a systematic treatment across all devices, significant
refactoring was required

Roadmap

MDDB 1.0

will document only those modes which we can treat rigorously
with our current methods